Trait serde::de::MapVisitor [−] [src]

pub trait MapVisitor {
    type Error: Error;
    fn visit_key_seed<K>(
        &mut self, 
        seed: K
    ) -> Result<Option<K::Value>, Self::Error>
    where
        K: DeserializeSeed;

    fn visit_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error>
    where
        V: DeserializeSeed;

    fn visit_seed<K, V>(
        &mut self, 
        kseed: K, 
        vseed: V
    ) -> Result<Option<(K::Value, V::Value)>, Self::Error>
    where
        K: DeserializeSeed,
        V: DeserializeSeed,
    { ... }

    fn visit_key<K>(&mut self) -> Result<Option<K>, Self::Error>
    where
        K: Deserialize,
    { ... }

    fn visit_value<V>(&mut self) -> Result<V, Self::Error>
    where
        V: Deserialize,
    { ... }

    fn visit<K, V>(&mut self) -> Result<Option<(K, V)>, Self::Error>
    where
        K: Deserialize,
        V: Deserialize,
    { ... }

    fn size_hint(&self) -> (usize, Option<usize>) { ... }
}

MapVisitor visits each item in a sequence.

This is a trait that a Deserializer passes to a Visitor implementation.

Associated Types

The error type that can be returned if some error occurs during deserialization.

Required Methods

This returns Ok(Some(key)) for the next key in the map, or Ok(None) if there are no more remaining entries.

Deserialize implementations should typically use MapVisitor::visit_key or MapVisitor::visit instead.

This returns a Ok(value) for the next value in the map.

Deserialize implementations should typically use MapVisitor::visit_value instead.

Provided Methods

This returns Ok(Some((key, value))) for the next (key-value) pair in the map, or Ok(None) if there are no more remaining items.

MapVisitor implementations should override the default behavior if a more efficient implementation is possible.

Deserialize implementations should typically use MapVisitor::visit instead.

This returns Ok(Some(key)) for the next key in the map, or Ok(None) if there are no more remaining entries.

This method exists as a convenience for Deserialize implementations. MapVisitor implementations should not override the default behavior.

This returns a Ok(value) for the next value in the map.

This method exists as a convenience for Deserialize implementations. MapVisitor implementations should not override the default behavior.

This returns Ok(Some((key, value))) for the next (key-value) pair in the map, or Ok(None) if there are no more remaining items.

This method exists as a convenience for Deserialize implementations. MapVisitor implementations should not override the default behavior.

Return the lower and upper bound of items remaining in the sequence.

Implementations on Foreign Types

impl<'a, V_> MapVisitor for &'a mut V_ where
    V_: MapVisitor, 
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Implementors